期刊
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
卷 115, 期 15, 页码 3782-3787出版社
NATL ACAD SCIENCES
DOI: 10.1073/pnas.1711862115
关键词
end-Permian mass extinction; Li isotopes; Meishan section; continental weathering; Permian-Triassic boundary
资金
- Strategic Priority Research Program (B) of the Chinese Academy of Sciences [XDB18000000]
- National Natural Science Foundation of China [41673031, 41721002, 41603005, 41473033, 41330102]
- 111 Project
Lithium (Li) isotope analyses of sedimentary rocks from the Meishan section in South China reveal extremely light seawater Li isotopic signatures at the Permian-Triassic boundary (PTB), which coincide with the most severe mass extinction in the history of animal life. Using a dynamic seawater lithium box model, we show that the light seawater Li isotopic signatures can be best explained by a significant influx of riverine [Li] with light delta Li-7 to the ocean realm. The seawater Li isotope excursion started >= 300 Ky before and persisted up to the main extinction event, which is consistent with the eruption time of the Siberian Traps. The eruption of the Siberian Traps exposed an enormous amount of fresh basalt and triggered CO2 release, rapid global warming, and acid rains, which in turn led to a rapid enhancement of continental weathering. The enhanced continental weathering delivered excessive nutrients to the oceans that could lead to marine eutrophication, anoxia, acidification, and ecological perturbation, ultimately resulting in the end-Permian mass extinction.
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